13 results about "Bright star" patented technology

The invention relates to a high-real-time daytime stray light star map star point extraction method, which comprises the following steps of: firstly, carrying out stray light background suppression on a star map by adopting an improved soft morphological filtering algorithm; and removing residual single-point noise from the image subjected to stray light suppression by adopting a morphological opening operation. Secondly, bright pixels are extracted from the filtered star map, four-connected-domain judgment is carried out through a clustering method, the connected domains are ranked from high to low according to the total energy, and four stars with the highest energy are selected to carry out triangle recognition matching based on a bright star table; thirdly, postures are calculated based on the successfully matched star points, and the star points in the view field are back-projected to an original star image surface in combination with a complete star catalogue; and finally, windowing an original star map according to the calculated star point image plane coordinates, performing stray light suppression on a window image by adopting an edge pixel fitting method, and completing star point extraction by adopting adaptive threshold segmentation and a four-connected-domain judgment algorithm.

The invention discloses a star point motion parameter estimation method for a high-dynamic star sensor. The method specifically comprises the following steps: (1) acquiring a star map under a dynamic condition through a fixed star sensor; (2) carrying out filtering preprocessing on the fixed star sensor image obtained in the step (1); (3) carrying out threshold segmentation on the image processed in the step (2) and carrying out connected domain extraction to obtain rough star points; (4) selecting the brightest star point in the star points obtained in the step (3); (5) obtaining a sub-pixel star point track by using the brightest star point adjacent area obtained in the step (4) and adopting a Zernike moment sub-pixel edge extraction method; and (6) utilizing the sub-pixel star point trajectory obtained in the step (5), and adopting least square fitting to obtain star point motion parameters. The method has the beneficial effects that the precision of star point trailing length and angle estimation is improved, so that the extraction precision of star points in a dynamic environment is improved, and the precision of a fixed star sensor is improved.

1. Name of the design product: Cartoon image model (Bright Star). 2. Use of the design product: Cartoon image model for corporate image promotion and product promotion. 3. Design key points of the design product: The combination of shape and pattern. 4. Picture or photo that best shows the design key points: Front view.

A method for measuring a shape of a reflector surface of a heliostat at night using a bright star at different elevation and azimuthal settings according to an embodiment of the current invention includes setting the heliostat in fixed orientation such that aberrated and overlapping star images formed are translated due to Earth's rotation in a translation direction across the heliostat array receiver; viewing images of the bright star using a fixed array of cameras placed at or near an array receiver of the heliostat, wherein each camera of the fixed array of cameras has a large aperture lens, and simultaneous exposures are made quickly enough and repeated for long enough, so that, as they translate past the cameras, the aberrated star image is fully sampled in two dimensions, and wherein every point on the reflector surface of the heliostat appears in one or more of the recorded images as being bright from reflected starlight; and processing the recorded images from the fixed array of cameras with a data processor to obtain the surface shape by integration of the surface slopes.

The present invention relates to a method for detecting faint space targets under a deep space background, which includes the steps of uniform bright star extraction, bright star feature expression and matching, global inter-frame registration, precise matching of dark stars in local areas, deformation field calculation, inter-frame alignment background suppression, and faint target extraction. A uniform bright star extraction strategy is adopted to reduce the influence of dark stars on bright star matching. Feature expression and angular distance constraints can ensure correct matching of bright stars during large inter-frame maneuvers, and global inter-frame registration is effective. A coarse-to-fine inter-frame registration strategy is adopted to update the accuracy of dark star coordinates during local alignment, improve the accuracy of deformation field, reduce background suppression noise interference, and be more robust to large field of view and large edge distortion. The method can identify discordant targets with local inter-frame motion in the field of view at the first time, provide potential faint target positions in each frame for inter-frame trajectory association, and improve the detection rate of faint targets.

A fast star map recognition method based on the fusion and prediction of refraction star / non-refraction star information. In the star sensor window tracking mode, according to the predicted attitude, the navigation stars appearing in the field of view can be searched, and the refraction stars with large refraction angles are retained first, and the remaining stars are retained first. A total of N navigation stars that meet the accuracy requirements are retained. According to the projection position of the navigation star on the image plane, if it is a refraction star, it is projected according to the visual position after refraction. After the FPGA window is opened, star point extraction is performed. After the star point extraction is completed, the navigation star marked as the non-refraction star window is used for star point identification and matching, and the inertial attitude of the star sensor is calculated to calculate the angular velocity of the star sensor and predict the attitude of the next frame. After the star point extraction is successful in the window marked as the refraction star, the image plane position is converted into an inertial vector according to the attitude calculated by the non-refraction star, and it is matched with the corresponding inertial vector in the navigation star catalog to obtain the refraction angle of the refraction star.

1. The name of the product of this design: Bracelet (Bright Star). 2. Purpose of the product of this design: wearable jewelry. 3. The design key point of this appearance design product lies in the shape. 4. The picture or photo that best illustrates the design points: three-dimensional picture. 5. Already reflected in other views, the top view and bottom view are omitted.

The invention, which relates to the technical field of astronomical image photometric measurement, discloses an under-sampling astronomical image high-precision photometric method under a pixel phase error constraint, comprising: acquiring all astronomical images of a target fixed star, and constructing an astronomical image data set; designing a phase error constraint: reserving an astronomical image of which the pixel phase absolute value of an X axis or a Y axis is greater than 0.2 pixel; carrying out star image centering on all star images in the star image data set to obtain pixel phase information of the center of each star image, and screening the star image data set based on the phase error constraint; performing aperture metering on the reserved astronomical images to obtain the luminosity value of each astronomical image; according to the method, the astronomical image with the astronomical image center close to the pixel edge is selected to carry out photometry average value statistics, the influence of pixel phase errors can be effectively eliminated, the astronomical image photometry precision can be remarkably improved, the photometry precision is improved to 0.008 star magnitude precision from 0.06 star magnitude precision of a traditional method for an under-sampling bright star with the full width at half maximum of 0.5 pixel, and the photometry precision is obviously improved.

1. The name of this design product: Chandelier Accessories (10510 Brilliant Stars). 2. Application of this design product: for indoor lighting. 3. The key point of the design of this product lies in its shape. 4. The picture or photo that best illustrates the key points of the design: Design 1 three-dimensional diagram. 5. Designate Design 1 as the base design.

The invention relates to a dark space target detection method under a deep space background. The method comprises the steps of uniform bright star extraction, bright star feature expression and matching, global inter-frame registration, local area dark star accurate matching, deformation field calculation, inter-frame alignment background suppression, dark target extraction and the like. A uniform bright star extraction strategy is adopted to reduce the influence of dark stars on bright star matching, and feature expression and angular distance constraint can ensure that bright star matching is correct and global inter-frame registration is effective during inter-frame large maneuver. A coarse-to-fine inter-frame registration strategy is adopted, dark star coordinate precision is updated during local alignment, deformation field precision is improved, background suppression noise interference is reduced, and robustness is higher for large-view-field and large-edge distortion. According to the method, the disharmonious target moving between local frames of the field of view can be identified at the first time, a potential faint target position of each frame is provided for inter-frame track association, and the faint target detection rate is improved.

A method for measuring a shape of a reflector surface of a heliostat at night using a bright star at different elevation and azimuthal settings according to an embodiment of the current invention includes setting the heliostat in fixed orientation such that aberrated and overlapping star images formed are translated due to Earth's rotation in a translation direction across the heliostat array receiver; viewing images of the bright star using a fixed array of cameras placed at or near an array receiver of the heliostat, wherein each camera of the fixed array of cameras has a large aperture lens, and simultaneous exposures are made quickly enough and repeated for long enough, so that, as they translate past the cameras, the aberrated star image is fully sampled in two dimensions, and wherein every point on the reflector surface of the heliostat appears in one or more of the recorded images as being bright from reflected starlight; and processing the recorded images from the fixed array of cameras with a data processor to obtain the surface shape by integration of the surface slopes.

The utility model discloses a night sky bright star instantaneous image acquisition device and a starry sky viewing suitability determination system. The night-sky bright star instantaneous image acquisition device comprises a telephoto lens and a CMOS image sensor for bright star instantaneous image acquisition, the CMOS image sensor for bright star instantaneous image acquisition is arranged in a CMOS photosensitive chip box, the CMOS photosensitive chip box is fixed at one end of the telephoto lens, the CMOS image sensor for bright star instantaneous image acquisition and the telephoto lens are coaxially arranged, and the CMOS photosensitive chip box is fixed at the other end of the telephoto lens. The telephoto lens and the CMOS photosensitive chip box which are connected into a whole are installed on the lens azimuth control assembly, and the telephoto lens can face a pre-shot target bright star under the control of the lens azimuth control assembly. The night daylight star instantaneous image acquisition device can provide reliable night daylight star instantaneous images for star sky viewing suitability judgment, and is low in cost and suitable for popularization.

The invention provides a dark and weak elongated star image extraction method, which can be applied to the technical field of space object detection, and comprises the following steps: preprocessing an observation image to obtain a preprocessed image; extracting bright star image information, and calculating to obtain a motion parameter and a point spread function parameter of a bright star image; constructing a Gabor convolution kernel function based on the motion parameters and the point spread function parameters; performing convolution processing on the original observation image by using a Gabor convolution kernel function to obtain a convolution filtering image; carrying out binarization processing on the convolution filtering image to obtain a binarized image; fusing the original observation image and the binary image to obtain a fused processing image; and based on the fusion processing image, extracting a dark and weak lengthened star image and the center position and flow of the star image. Dark target information is mined from an image through convolution processing, fusion processing is carried out in combination with an original image, and high-precision extraction of dark star image information is achieved. The invention also provides a dim elongated star image extraction device, equipment and a medium.